Method of dissolving resins.



v tic material adapted to be molded or otherknown that by means of thesolvents generreferred to owing to their peculiar character employed ora solution of resin a suitable UNITED, STATES PATENT OFFICE.

FRANZ GUSTAV KLEINSTEUBER, OF BERLIN, GERMANY.

METHOD OF DISSOLVING RESINS.

SPECIFICATION forming'part of Letters Patent No. 654,646, dated July 31,1900.

Application filed November 9, 1899.

To all whom it may concern:

Be it known that I, FRANZ GUSTAV KLEIN- STEUBER, a subject of the GrandDuke of Saxe- Weimar, residing at Pankow, Berlin, Germany, have inventedcertain new and useful mprovements in Methods of Dissolving Resins; andI do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

In the manufacture from resins of a plaswise shaped to any desired formwhich will harden on drying it is of course necessary tov dissolve theresinous material. It is well ally employed many species of resins canonly be incompletely dissolved, and this with great difficulty as, forinstance, the copals yet these very resins are particularly well adaptedfor the manufacture of the material and specific properties.

My invention has for its object a method orprocess whereby thedifliculties referred to are obviated and a complete solution of theresin readily efiected while the quality of the final product ismaterially enhanced. To these ends, I add to the resin solvent usuallyquantity of a compound which in conjunction with said solvent readilyand completely dissolves the resin and imparts to the final productproperties not possessed by similar products as heretofore manufactured.

In carrying dut my invention I prepare a compound consisting of asolution of dammar and tung or wood oil in benzole and oil ofturpentine, and of this I add to the resin solvent or to the resinsolution a quantity equal to from two to ten per cent. of the resin,according to the nature thereof. The properties of this compound may bematerially enhanced by the addition to the compound of oil of rosemary.

In practice I preferably prepare the compound as follows: I dissolve,say, three parts of dammar in five parts of oil of turpentine. I thenmix fifty parts of tung or wood oil,

twenty-three parts of benzole, and five parts of oil of turpentine andmix the same with the Serial No. 736,403- (No specimens.)

benzole, alcohol, oil of turpentine, or the like-and to this I add theresin to be dissolved and heat the mixture, while stirring the same, toa temperature of from 40 to 50 centigrade until the solution iscompleted,

and, as above stated, I may and in fact I prefer to add to the compoundof danimar, tungoil, benzole, and oil of turpentine above given abouttwo parts of oil of rosemary. This,

however, I prefer. to add after the mixture has been brought to thetemperature referred to, though itlmay be added before or at any stagebefore the composition has thickened.

Furthermore, and as heretofore stated, I may first prepare a solution ofthe resin in any usual solvent, so far as this can be done, and

then add thereto a suitable quantity of the compound and proceed asabove described.

If a filler-such as asbestos, mica, or the like-is to be mixed with thematerial, the compound may be added to the resinsolution after theadmixture therewith of such filler or before, as may be desired.

It will be understood that I do not limit myself to the exactproportions of the compoundsof dammar, tung or wood oil, oil ofturpentine, and oil of rosemary, as these may be varied within certainlimits, though I have found that the proportions given produce excellentresults. I have also found thatif the composition of matter obtained asabove described is allowed to stand from twenty-four to forty-eighthours a better final product is obtained.

By the process described the slimy constituents-of the resins, which areof the greatest importance to the final product, are com? pletelydissolved and become, intimatelyincorporated in the mass, and, as willbe readily understood, the manufacture of materials such as referred tofrom resins is greatly facilitated and expedited, while the finalproduct is superior in every respect to like products as heretofore madein that the compound added to the resin solvent or resin.

solution not only results in the complete dissolution of the same, butin that a more homogeneous, tough, and solid product is obtained, thebrittleness of which is reduced to a minimum, while the physicalproperties of the tung or wood oil, irrespective of its greatsuperiority to 1inseed-oil as a dryer, have a very material influence onthe final product, so that the latter is especially adapted to themanufacture of bodies or objects subjected to shock or jarring, andhence, to the use of such -final products aselectrotechnicalinsulations.

I do not claim herein the product of the matter of a divisionalapplication.

Having thus described myiuvention, what] I claim as new therein, anddesire to secure b Letters Patent, is-

1. The mode of dissolving resins,Which consists in mixing with the resinsolvent a suitable quantity ofa compound consisting of'a solution ofdamnlar and tung or wood oil in benzole and oil of turpentine, anddissolving the resin therein, substantially as set forth. 2. The mode ofdissolving resins, which consists in mixing with the resin solvent asuitable quantity of a compound consisting of a solution of dammar andtung or wood oil in benzole, oil of turpentine and oil of rosemary,

and dissolving the resin therein, substantially as set forth.

The mode of dissolving resins,which consistsin' forming a solutionthereof in the usual manner, mixing therewith a suitable quantity of acompound consisting of a solution of dammar and tung or wood oil in ben-'zole and oil of turpentine, and heating the mixture to from 40 to 50centigrade While stirring, substantially as set forth. describedprocess, as this forms the subject- 4. The mode of dissolvingresins,which consists in forminga solution of such in theiisuailinam'rer, mixing'therewith a suitable quantity of a compoundconsisting of a soluf tionofdammar and tung or wood oil in benzole andoil of turpentine, heating the mixture to from 40. to 50 centigradewhile stirring and adding thereto a suitable quantity of oil ofrosemary, substantially as set forth. In testimony that I claim theforegoing as my invention I have'signed my name in presence of twosubscribing witnesses.

FRANZ GUSTAV KLEINSTEUBER.

Witnesses:

WOLDEMAR HAUPT, HENRY HASPER.

